# Copyright (c) 2019 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Specification

Parsing of the specification YAML file.
"""


import logging
from yaml import load, YAMLError
from pprint import pformat

from errors import PresentationError
from utils import get_last_successful_build_number
from utils import get_last_completed_build_number


class Specification(object):
    """Specification of Presentation and analytics layer.

    - based on specification specified in the specification YAML file
    - presentation and analytics layer is model driven
    """

    # Tags are used in specification YAML file and replaced while the file is
    # parsed.
    TAG_OPENER = "{"
    TAG_CLOSER = "}"

    def __init__(self, cfg_file):
        """Initialization.

        :param cfg_file: File handler for the specification YAML file.
        :type cfg_file: BinaryIO
        """
        self._cfg_file = cfg_file
        self._cfg_yaml = None

        self._specification = {"environment": dict(),
                               "configuration": dict(),
                               "static": dict(),
                               "input": dict(),
                               "output": dict(),
                               "tables": list(),
                               "plots": list(),
                               "files": list(),
                               "cpta": dict()}

    @property
    def specification(self):
        """Getter - specification.

        :returns: Specification.
        :rtype: dict
        """
        return self._specification

    @property
    def environment(self):
        """Getter - environment.

        :returns: Environment specification.
        :rtype: dict
        """
        return self._specification["environment"]

    @property
    def configuration(self):
        """Getter - configuration.

        :returns: Configuration of PAL.
        :rtype: dict
        """
        return self._specification["configuration"]

    @property
    def static(self):
        """Getter - static content.

        :returns: Static content specification.
        :rtype: dict
        """
        return self._specification["static"]

    @property
    def mapping(self):
        """Getter - Mapping.

        :returns: Mapping of the old names of test cases to the new (actual)
            one.
        :rtype: dict
        """
        return self._specification["configuration"]["mapping"]

    @property
    def ignore(self):
        """Getter - Ignore list.

        :returns: List of ignored test cases.
        :rtype: list
        """
        return self._specification["configuration"]["ignore"]

    @property
    def alerting(self):
        """Getter - Alerting.

        :returns: Specification of alerts.
        :rtype: dict
        """
        return self._specification["configuration"]["alerting"]

    @property
    def input(self):
        """Getter - specification - inputs.
        - jobs and builds.

        :returns: Inputs.
        :rtype: dict
        """
        return self._specification["input"]

    @property
    def builds(self):
        """Getter - builds defined in specification.

        :returns: Builds defined in the specification.
        :rtype: dict
        """
        return self.input["builds"]

    @property
    def output(self):
        """Getter - specification - output formats and versions to be generated.
        - formats: html, pdf
        - versions: full, ...

        :returns: Outputs to be generated.
        :rtype: dict
        """
        return self._specification["output"]

    @property
    def tables(self):
        """Getter - tables to be generated.

        :returns: List of specifications of tables to be generated.
        :rtype: list
        """
        return self._specification["tables"]

    @property
    def plots(self):
        """Getter - plots to be generated.

        :returns: List of specifications of plots to be generated.
        :rtype: list
        """
        return self._specification["plots"]

    @property
    def files(self):
        """Getter - files to be generated.

        :returns: List of specifications of files to be generated.
        :rtype: list
        """
        return self._specification["files"]

    @property
    def cpta(self):
        """Getter - Continuous Performance Trending and Analysis to be
        generated.

        :returns: List of specifications of Continuous Performance Trending and
        Analysis to be generated.
        :rtype: list
        """
        return self._specification["cpta"]

    def set_input_state(self, job, build_nr, state):
        """Set the state of input

        :param job:
        :param build_nr:
        :param state:
        :return:
        """

        try:
            for build in self._specification["input"]["builds"][job]:
                if build["build"] == build_nr:
                    build["status"] = state
                    break
            else:
                raise PresentationError("Build '{}' is not defined for job '{}'"
                                        " in specification file.".
                                        format(build_nr, job))
        except KeyError:
            raise PresentationError("Job '{}' and build '{}' is not defined in "
                                    "specification file.".format(job, build_nr))

    def set_input_file_name(self, job, build_nr, file_name):
        """Set the state of input

        :param job:
        :param build_nr:
        :param file_name:
        :return:
        """

        try:
            for build in self._specification["input"]["builds"][job]:
                if build["build"] == build_nr:
                    build["file-name"] = file_name
                    break
            else:
                raise PresentationError("Build '{}' is not defined for job '{}'"
                                        " in specification file.".
                                        format(build_nr, job))
        except KeyError:
            raise PresentationError("Job '{}' and build '{}' is not defined in "
                                    "specification file.".format(job, build_nr))

    def _get_build_number(self, job, build_type):
        """Get the number of the job defined by its name:
         - lastSuccessfulBuild
         - lastCompletedBuild

        :param job: Job name.
        :param build_type: Build type:
         - lastSuccessfulBuild
         - lastCompletedBuild
        :type job" str
        :raises PresentationError: If it is not possible to get the build
        number.
        :returns: The build number.
        :rtype: int
        """

        # defined as a range <start, end>
        if build_type == "lastSuccessfulBuild":
            # defined as a range <start, lastSuccessfulBuild>
            ret_code, build_nr, _ = get_last_successful_build_number(
                self.environment["urls"]["URL[JENKINS,CSIT]"], job)
        elif build_type == "lastCompletedBuild":
            # defined as a range <start, lastCompletedBuild>
            ret_code, build_nr, _ = get_last_completed_build_number(
                self.environment["urls"]["URL[JENKINS,CSIT]"], job)
        else:
            raise PresentationError("Not supported build type: '{0}'".
                                    format(build_type))
        if ret_code != 0:
            raise PresentationError("Not possible to get the number of the "
                                    "build number.")
        try:
            build_nr = int(build_nr)
            return build_nr
        except ValueError as err:
            raise PresentationError("Not possible to get the number of the "
                                    "build number.\nReason: {0}".format(err))

    def _get_type_index(self, item_type):
        """Get index of item type (environment, input, output, ...) in
        specification YAML file.

        :param item_type: Item type: Top level items in specification YAML file,
        e.g.: environment, input, output.
        :type item_type: str
        :returns: Index of the given item type.
        :rtype: int
        """

        index = 0
        for item in self._cfg_yaml:
            if item["type"] == item_type:
                return index
            index += 1
        return None

    def _find_tag(self, text):
        """Find the first tag in the given text. The tag is enclosed by the
        TAG_OPENER and TAG_CLOSER.

        :param text: Text to be searched.
        :type text: str
        :returns: The tag, or None if not found.
        :rtype: str
        """
        try:
            start = text.index(self.TAG_OPENER)
            end = text.index(self.TAG_CLOSER, start + 1) + 1
            return text[start:end]
        except ValueError:
            return None

    def _replace_tags(self, data, src_data=None):
        """Replace tag(s) in the data by their values.

        :param data: The data where the tags will be replaced by their values.
        :param src_data: Data where the tags are defined. It is dictionary where
        the key is the tag and the value is the tag value. If not given, 'data'
        is used instead.
        :type data: str or dict
        :type src_data: dict
        :returns: Data with the tags replaced.
        :rtype: str or dict
        :raises: PresentationError if it is not possible to replace the tag or
        the data is not the supported data type (str, dict).
        """

        if src_data is None:
            src_data = data

        if isinstance(data, str):
            tag = self._find_tag(data)
            if tag is not None:
                data = data.replace(tag, src_data[tag[1:-1]])

        elif isinstance(data, dict):
            counter = 0
            for key, value in data.items():
                tag = self._find_tag(value)
                if tag is not None:
                    try:
                        data[key] = value.replace(tag, src_data[tag[1:-1]])
                        counter += 1
                    except KeyError:
                        raise PresentationError("Not possible to replace the "
                                                "tag '{}'".format(tag))
            if counter:
                self._replace_tags(data, src_data)
        else:
            raise PresentationError("Replace tags: Not supported data type.")

        return data

    def _parse_env(self):
        """Parse environment specification in the specification YAML file.
        """

        logging.info("Parsing specification file: environment ...")

        idx = self._get_type_index("environment")
        if idx is None:
            return None

        try:
            self._specification["environment"]["configuration"] = \
                self._cfg_yaml[idx]["configuration"]
        except KeyError:
            self._specification["environment"]["configuration"] = None

        try:
            self._specification["environment"]["paths"] = \
                self._replace_tags(self._cfg_yaml[idx]["paths"])
        except KeyError:
            self._specification["environment"]["paths"] = None

        try:
            self._specification["environment"]["urls"] = \
                self._cfg_yaml[idx]["urls"]
        except KeyError:
            self._specification["environment"]["urls"] = None

        try:
            self._specification["environment"]["make-dirs"] = \
                self._cfg_yaml[idx]["make-dirs"]
        except KeyError:
            self._specification["environment"]["make-dirs"] = None

        try:
            self._specification["environment"]["remove-dirs"] = \
                self._cfg_yaml[idx]["remove-dirs"]
        except KeyError:
            self._specification["environment"]["remove-dirs"] = None

        try:
            self._specification["environment"]["build-dirs"] = \
                self._cfg_yaml[idx]["build-dirs"]
        except KeyError:
            self._specification["environment"]["build-dirs"] = None

        try:
            self._specification["environment"]["testbeds"] = \
                self._cfg_yaml[idx]["testbeds"]
        except KeyError:
            self._specification["environment"]["testbeds"] = None

        logging.info("Done.")

    def _parse_configuration(self):
        """Parse configuration of PAL in the specification YAML file.
        """

        logging.info("Parsing specification file: configuration ...")

        idx = self._get_type_index("configuration")
        if idx is None:
            logging.warning("No configuration information in the specification "
                            "file.")
            return None

        try:
            self._specification["configuration"] = self._cfg_yaml[idx]

        except KeyError:
            raise PresentationError("No configuration defined.")

        # Data sets: Replace ranges by lists
        for set_name, data_set in self.configuration["data-sets"].items():
            if not isinstance(data_set, dict):
                continue
            for job, builds in data_set.items():
                if builds:
                    if isinstance(builds, dict):
                        build_end = builds.get("end", None)
                        try:
                            build_end = int(build_end)
                        except ValueError:
                            # defined as a range <start, build_type>
                            build_end = self._get_build_number(job, build_end)
                        builds = [x for x in range(builds["start"], build_end+1)
                                  if x not in builds.get("skip", list())]
                        self.configuration["data-sets"][set_name][job] = builds

        # Data sets: add sub-sets to sets (only one level):
        for set_name, data_set in self.configuration["data-sets"].items():
            if isinstance(data_set, list):
                new_set = dict()
                for item in data_set:
                    try:
                        for key, val in self.configuration["data-sets"][item].\
                                items():
                            new_set[key] = val
                    except KeyError:
                        raise PresentationError(
                            "Data set {0} is not defined in "
                            "the configuration section.".format(item))
                self.configuration["data-sets"][set_name] = new_set

        # Mapping table:
        mapping = None
        mapping_file_name = self._specification["configuration"].\
            get("mapping-file", None)
        if mapping_file_name:
            logging.debug("Mapping file: '{0}'".format(mapping_file_name))
            try:
                with open(mapping_file_name, 'r') as mfile:
                    mapping = load(mfile)
                logging.debug("Loaded mapping table:\n{0}".format(mapping))
            except (YAMLError, IOError) as err:
                raise PresentationError(
                    msg="An error occurred while parsing the mapping file "
                        "'{0}'.".format(mapping_file_name),
                    details=repr(err))
        # Make sure everything is lowercase
        if mapping:
            self._specification["configuration"]["mapping"] = \
                {key.lower(): val.lower() for key, val in mapping.iteritems()}
        else:
            self._specification["configuration"]["mapping"] = dict()

        # Ignore list:
        ignore = None
        ignore_list_name = self._specification["configuration"].\
            get("ignore-list", None)
        if ignore_list_name:
            logging.debug("Ignore list file: '{0}'".format(ignore_list_name))
            try:
                with open(ignore_list_name, 'r') as ifile:
                    ignore = load(ifile)
                logging.debug("Loaded ignore list:\n{0}".format(ignore))
            except (YAMLError, IOError) as err:
                raise PresentationError(
                    msg="An error occurred while parsing the ignore list file "
                        "'{0}'.".format(ignore_list_name),
                    details=repr(err))
        # Make sure everything is lowercase
        if ignore:
            self._specification["configuration"]["ignore"] = \
                [item.lower() for item in ignore]
        else:
            self._specification["configuration"]["ignore"] = list()

        logging.info("Done.")

    def _parse_input(self):
        """Parse input specification in the specification YAML file.

        :raises: PresentationError if there are no data to process.
        """

        logging.info("Parsing specification file: input ...")

        idx = self._get_type_index("input")
        if idx is None:
            raise PresentationError("No data to process.")

        try:
            for key, value in self._cfg_yaml[idx]["general"].items():
                self._specification["input"][key] = value
            self._specification["input"]["builds"] = dict()

            for job, builds in self._cfg_yaml[idx]["builds"].items():
                if builds:
                    if isinstance(builds, dict):
                        build_end = builds.get("end", None)
                        try:
                            build_end = int(build_end)
                        except ValueError:
                            # defined as a range <start, build_type>
                            build_end = self._get_build_number(job, build_end)
                        builds = [x for x in range(builds["start"], build_end+1)
                                  if x not in builds.get("skip", list())]
                    self._specification["input"]["builds"][job] = list()
                    for build in builds:
                        self._specification["input"]["builds"][job]. \
                            append({"build": build, "status": None})

                else:
                    logging.warning("No build is defined for the job '{}'. "
                                    "Trying to continue without it.".
                                    format(job))
        except KeyError:
            raise PresentationError("No data to process.")

        logging.info("Done.")

    def _parse_output(self):
        """Parse output specification in the specification YAML file.

        :raises: PresentationError if there is no output defined.
        """

        logging.info("Parsing specification file: output ...")

        idx = self._get_type_index("output")
        if idx is None:
            raise PresentationError("No output defined.")

        try:
            self._specification["output"] = self._cfg_yaml[idx]
        except (KeyError, IndexError):
            raise PresentationError("No output defined.")

        logging.info("Done.")

    def _parse_static(self):
        """Parse specification of the static content in the specification YAML
        file.
        """

        logging.info("Parsing specification file: static content ...")

        idx = self._get_type_index("static")
        if idx is None:
            logging.warning("No static content specified.")

        for key, value in self._cfg_yaml[idx].items():
            if isinstance(value, str):
                try:
                    self._cfg_yaml[idx][key] = self._replace_tags(
                        value, self._specification["environment"]["paths"])
                except KeyError:
                    pass

        self._specification["static"] = self._cfg_yaml[idx]

        logging.info("Done.")

    def _parse_elements(self):
        """Parse elements (tables, plots) specification in the specification
        YAML file.
        """

        logging.info("Parsing specification file: elements ...")

        count = 1
        for element in self._cfg_yaml:
            try:
                element["output-file"] = self._replace_tags(
                    element["output-file"],
                    self._specification["environment"]["paths"])
            except KeyError:
                pass

            try:
                element["input-file"] = self._replace_tags(
                    element["input-file"],
                    self._specification["environment"]["paths"])
            except KeyError:
                pass

            # add data sets to the elements:
            if isinstance(element.get("data", None), str):
                data_set = element["data"]
                try:
                    element["data"] = self.configuration["data-sets"][data_set]
                except KeyError:
                    raise PresentationError("Data set {0} is not defined in "
                                            "the configuration section.".
                                            format(data_set))

            if element["type"] == "table":
                logging.info("  {:3d} Processing a table ...".format(count))
                try:
                    element["template"] = self._replace_tags(
                        element["template"],
                        self._specification["environment"]["paths"])
                except KeyError:
                    pass

                # add data sets
                try:
                    for item in ("reference", "compare"):
                        if element.get(item, None):
                            data_set = element[item].get("data", None)
                            if isinstance(data_set, str):
                                element[item]["data"] = \
                                    self.configuration["data-sets"][data_set]

                    if element.get("history", None):
                        for i in range(len(element["history"])):
                            data_set = element["history"][i].get("data", None)
                            if isinstance(data_set, str):
                                element["history"][i]["data"] = \
                                    self.configuration["data-sets"][data_set]

                except KeyError:
                    raise PresentationError("Wrong data set used in {0}.".
                                            format(element.get("title", "")))

                self._specification["tables"].append(element)
                count += 1

            elif element["type"] == "plot":
                logging.info("  {:3d} Processing a plot ...".format(count))

                # Add layout to the plots:
                layout = element["layout"].get("layout", None)
                if layout is not None:
                    element["layout"].pop("layout")
                    try:
                        for key, val in (self.configuration["plot-layouts"]
                                         [layout].items()):
                            element["layout"][key] = val
                    except KeyError:
                        raise PresentationError("Layout {0} is not defined in "
                                                "the configuration section.".
                                                format(layout))
                self._specification["plots"].append(element)
                count += 1

            elif element["type"] == "file":
                logging.info("  {:3d} Processing a file ...".format(count))
                try:
                    element["dir-tables"] = self._replace_tags(
                        element["dir-tables"],
                        self._specification["environment"]["paths"])
                except KeyError:
                    pass
                self._specification["files"].append(element)
                count += 1

            elif element["type"] == "cpta":
                logging.info("  {:3d} Processing Continuous Performance "
                             "Trending and Analysis ...".format(count))

                for plot in element["plots"]:
                    # Add layout to the plots:
                    layout = plot.get("layout", None)
                    if layout is not None:
                        try:
                            plot["layout"] = \
                                self.configuration["plot-layouts"][layout]
                        except KeyError:
                            raise PresentationError(
                                "Layout {0} is not defined in the "
                                "configuration section.".format(layout))
                    # Add data sets:
                    if isinstance(plot.get("data", None), str):
                        data_set = plot["data"]
                        try:
                            plot["data"] = \
                                self.configuration["data-sets"][data_set]
                        except KeyError:
                            raise PresentationError(
                                "Data set {0} is not defined in "
                                "the configuration section.".
                                format(data_set))
                self._specification["cpta"] = element
                count += 1

        logging.info("Done.")

    def read_specification(self):
        """Parse specification in the specification YAML file.

        :raises: PresentationError if an error occurred while parsing the
        specification file.
        """
        try:
            self._cfg_yaml = load(self._cfg_file)
        except YAMLError as err:
            raise PresentationError(msg="An error occurred while parsing the "
                                        "specification file.",
                                    details=str(err))

        self._parse_env()
        self._parse_configuration()
        self._parse_input()
        self._parse_output()
        self._parse_static()
        self._parse_elements()

        logging.debug("Specification: \n{}".
                      format(pformat(self._specification)))